Hello, due to a mini-update of Steam, until 16 December 10 am (USA time), if you have your account protected by Steam Guard Mobile Authenticator, you can have discounts on Steam Market of 5-33%.
Probably, you will wonder what this Steam Guard Mobile Authenticator does, well it is another protection for your account and whenever you login to your account you need to enter a code sent into a text message on your phone, this way you have another step of security for your account and you will avoid trade holds. (More details here).
If you would like to add this security step, you have the tutorial here. (Note*: You have to do this step from your phone, it can not be executed from your computer).
An example of how the discounts will be shown:
I hope this information helped you, if you need help i am waiting for your questions in this topic.
Good luck!